Search

This paper designed and completed the different polymer dosage of recycled concrete, was prepared by adding amount was 7%, 14%, 21%, 14% styrene butadiene latex recycled concrete, recycled rubber powder recycled concrete and ordinary concrete block, the cube compressive strength and damping performance test. The cube compressive strength of concrete test according to the ordinary concrete mechanics performance test methods, specimen is 150×150×150 mm cube specimens, pressure testing machine loading speed is 0.5 MPa per second. The concrete damping performance test is carried out according to the free attenuation method, with the hammer vibration test device, the test piece is T type. Based on the damage form of specimens, the compressive strength and damping performance analysis, and compared with ordinary concrete as the benchmark analysis test results show that the polymer recycled concrete cube compressive strength failure process and failure pattern basic consistent with common concrete. In the water/cement ratio, sand ratio, and amount of material per unit volume is the same, under the condition of polymer recycled concrete cube compressive strength is lower than normal concrete, damping performance is higher than that of ordinary concrete, the compressive strength is inversely proportional to the damping sexual relations.

The Fe-RE (RE=Gd, Tb, Dy, Lu) binary systems with the experimental data of phase equilibria and thermodynamic properties in the published literature were reviewed firstly. Based on available phase equilibria data and thermodynamic data, the Fe-RE (RE=Gd, Tb, Dy, Lu) binary systems were assessed thermodynamically using the CALPHAD method. As a result, further experimental investigations and thermodynamic calculations would be both required in order to develop thermodynamic database of the RE-Fe-B ternary systems, which is very useful to study the relations between alloy compositions, microstructure and magnetic properties of novel Nd-Fe-B-based permanent magnets.

Through soil samples collecting and analysis in Hebei plain, we studied acidity characteristics and acidification sensitivity in Hebei plain. Results showed that the main reasons for decline in soil pH value is the atmospheric acid deposition, the excessive application of nitrogen and phosphorus fertilizer, crop base ion absorption. The dissolve of calcium carbonate is the main process plain cushion soil acidification in Hebei plain, its content is the decisive factor of soil acidification sensitivity.

Since the development of economics and society, secured and reliable power supply has become essential. Model and diagrams management remains the fundamental technology for distribution automation and smart distribution system. However, distribution system develops rapidly, simple model and diagrams management and maintenance with GIS would not satisfy the requirements by system operation. In this paper, we propose panorama dispatching technologies as integrative solution for smart distribution system. Firstly, the framework of panorama dispatching technologies is established; then key technologies for panorama dispatching technologies are introduced. With our proposed methods and technologies, the distribution system operators can not only manage and examine accuracy of model and diagram, but also work on a unique strategic diagram to better understand and dispatch the system with multiple levels and views of panorama diagrams. The results in this paper are very useful for distribution automation and smart distribution system.

This research proposes an improved tunable piezoelectric harvester structure which is constructed by a cantilever base beam and piezoelectric elements working in d33 mode. Our previous work on tunable piezoelectric harvester structure showed a frequency variation ratio of 3.17% with piezoelectric elements working in d31mode coupling. In this work, by changing the working mode of the piezoelectric elements from d31 to d33 mode, the frequency variation ratio was shown to be much higher. Theoretical analysis of the improved structure was investigated and verified with simulations. The results showed that the d33 mode coupling surpasses the d31 mode coupling with a frequency variation ratio of 29.74%.

A series of new alloys including Pt-Ir-M (M=Zr, Mo, Y) were invented in this study. The physical properties, electrical properties parameters and thermodynamics database of the alloys were established. The phase structure and composition were analyzed. The calculation results were verified by experiments. The influence of solidification rate to microstructures, morphology and grain size of Pt-Ir-M alloys were analyzed. According to First Principle, the electronic structures, bonding characters and energetic stability of the alloys were calculated, the calculate result indicated that Pt-Ir-Mo is formed more easily than Pt-Ir-Zr and Pt-Ir-Y, and the formed Pt-Ir-Mo is more stable than Pt-Ir-Zr and Pt-Ir-Y.

The anchoring of CFRP tendon can be performed by wedging, bonding or compressing. The wedge type anchor, used for PS steel tendon, is inappropriate for direct application to the CFRP tendon due to its low lateral stiffness. Since the bond performance of the CFRP tendon depends on the anchor performance, the bond type anchor presents the problem of requiring long steel sleeve in case of low bond performance or high tensile performance. Compared to the bond type anchor, the compressing type anchor offers better applicability but necessitates the development of a sleeve fitted to the dimensions of each CFRP tendon. This study intends to examine the anchoring characteristics of the compressed sleeve for the temporary anchorage of a CFRP tendon with diameter of 10 mm. To that goal, the properties of the 10 mm-diameter CFRP tendon were assessed using the bond type anchor and the corresponding anchor performance is compared to that of the compressed anchor. The test results revealed that the use of spacers in the compressed anchor provided lower anchor performance due to the characteristics of the spacers. For the specimen without spacer, the micro-deformations formed inside the sleeve were seen to compress the CFRP tendon by gearing directly the tendon and to provide anchor performance reaching about 72% of the tensile strength of the CFRP tendon. Further study shall develop a sleeve with increased compress force on the CFRP tendon so as to improve the anchor performance of the compressed sleeve. Moreover, solution shall also be provided to introduce a uniform compress force.

Ultra High Strength Steel (UHSS) hot stamping technology is a special process which can enhance the steel tensile strength to 1500MPa. Appling this technology in producing vehicle structure parts can make car lighter and safer. In China there are more and more automobile enterprises adopt this technology. To master and extend the skill, China Academy of Machinery Science & Technology (CAM) have done systematic research, such as the strengthen mechanism of the steel, hot stamping key devices designing, forming and quenching integrated mould designing, stamping process parameters optimization, etc.. By now, CAM has mastered the mass production technology of vehicle parts, which can guarantee its shape and tensile strength, and produced such typical parts as door-beam, B pillar, etc.. The paper is an introduction of the research work and achievement about UHSS hot stamping developed by CAM.

Despite of their outstanding axial strength, CFRP tendons necessitate special anchorage due to their low lateral shear strength. In order to cope with such CFRP tendon, the conventional bond type anchor needs to be improved. The results of bond tests executed on 10-mm diameter CFRP tendons coated with sand and oxide revealed that, even if the average bond strength increases by 3 times compared to the non-coated bare tendon, the coated CFRP tendon still requires excessively long anchored length for bonding. Therefore, this study applies a method enabling to shorten the bonded length and improving further the bond performance compared to sand or oxide coating. The improvement of the bond characteristics is achieved by splitting the ends of the CFRP tendon so as to widen the bonded area by 3.5 times. The test results showed that the anchor performance of the CFRP tendon reaches 95% of its tensile strength making it applicable for the bond type anchor.

Due to the yield strength σs, tensile strength σb of high-strength steel is much higher than original one, it is applied in making auto’s structure parts to improve the security of passengers and reduce the weight of auto. To make the production of the cold-stamp parts easier, the paper analyzed the structure of a classical part, door-beam, and found that the surface of the part should be G1 continuity at least, rather than G0 continuity. The G1 continuity part has more uniform thickness, less inner strain, and more safety from cracking.

The main reason for slow development of energy-saving buildings are differences in the benefit of all stakeholders to appeal. Identifying stakeholders, and on the basis of analysis all parties interests and needs, energy-saving building Life Cycle Cost-Benefit Model was established. Then we can find the equilibrium point among the government, developer and consumer, and factors of impacting the development of energy-saving buildings. Last we provide advice for the rapid development of energy-saving buildings.

In recent years, many progressive collapse accidents have occurred at home and abroad, due to the progressive collapses of a structure that often disproportion between initial damages and large collapses, these accidents caused significant casualties and serious economic losses. This paper first analyzes the research background and the definition of progressive collapse, then contrasts China with Britain, the United States, Europe and other countries for theory research status, specification research status, engineering and simulation research status, prevention measures of progressive collapse. Compared with other countries I have found that if our country introduced a comprehensive related design specifications, some progressive collapse accidents can be avoided or ease. So there will be plenty of work to be done in our country.

Adding polymer into cement concrete is used to increase the interlayer bonding performance. The impact of polymer on the interlayer bonding performance was studied by shear strength and tensile strength test. The mix design of the interface agent was optimized through the tensile bending tests of different fiber and polymer dosage. The impact of casting methods and interface agent mix was studied through tests. The test results show that: adding organic fiber and polymer into cement concrete could significantly increase the interlayer bond strength. The interface agent of SBR (styrene-butadiene rubber) latex modified cement paste has better tensile bonding properties. When the ratio of cement to DB-1 latex is 3:2, it will effectively increase the interlayer bonding performance of cement concrete.

The cost and benefits have been analyzed of applying SM570 steel to tall buildings in Taiwan. In detail, two 40-story steel buildings are designed for the Taipei Microzonation II. One building has SN490B steel columns. The other also uses SM570 steel for the 1st -to- 14th -story columns. The stress ratios and story drift ratios are limited to 0.9 and 0.005, respectively. The drift demands are then evaluated by using nonlinear time history analyses with 14 sets of ground motions scaled to the intensity for the return periods of 475 and 2500 years. By FEMA 356, the building fragility is further assessed using the drift ratios of 2.5% and 5% for life safety and collapse prevention. It is concluded that the use of SM570 steel saves 140 tons steel in total, approximately 3%. That also reduces the seismic drift demands of the building, greatly decreasing the failure probability against earthquake collapse.

In the paper, according to crushing and attrition of material on mixer blade, the mechanical model of material on blade is established. According to nonlinear vibration and the basic theory of rotor dynamics, Mechanical model of vibration system and differential equations of motion are established. This paper has adopted the arithmetic of fourth-order Runge-Kutta, analyzing wave forms graph, chart of axis track, phase plane plot of system movement. Analysis results show that mixer system appears chaotic motion under some certain design parameters. This state of motion on mixers can better destroy cement coagulation group, increasing the number of effective collision of concrete particle, which can effectively improve the microscopic homogeneity of concrete and improve efficiency of concrete mixing.

The biocompatibility of the austenitic stainless steel with different nitrogen contents was studied, The MTT(3-(4,5-Dimethylthi azol-2-yl)-2,5-diphenyltetra zolium bromide) assay, platelet adhesion and hemolysis rate test were used to examine the cytotoxicity. The cell compatibility of materials was investigated by cell adhesion test. Hemolysis rate test and platelet adhesion were used to examine the blood compatibility. The cell toxicity test showed that the nickel free austenitic stainless steel materials of different nitrogen content and the control group of titanium alloy materials had no significant side effects for vascular endothelial cells. The cell adhesion test showed that the cell number of vascular endothelial in the austenitic stainless steel was more than the titanium alloy materials, and the cells grow in good condition. The hemolysis rate was lower than 5%, and the influence of platelet was not significant, and pyrogen test results can be considered that such material extracts heat checking compliance with safety regulations.

Common methods for reducing image size include scaling and cropping. However, these two approaches have some quality problems for reduced images. In this paper, we propose an image reducing algorithm by separating the main objects and the background. First, we extract two feature maps, namely, an enhanced visual saliency map and an improved gradient map from an input image. After that, we integrate these two feature maps to an importance map. Finally, we generate the target image using the importance map. The proposed approach can obtain desired results for a wide range of images.

Graphene/platinum composite gel was prepared with chloroplatinic acid and graphene oxide (GO) as precursors by in-situ reduction method. Grapheme/platinum composite film as counter electrode was prepared on fluorine-doped tin oxide (FTO) glass by electro-hydrodynamic (EHD) method. Battery was assembled with nanoTiO2film as anode, N3 dye, and ionic liquid electrolyte. It was characterized by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and X-ray Diffraction (XRD). Graphene/platinum composite film include very thin graphene layers, with platinum particles of an average dimension dispersed evenly in graphene layers. This device shows similar photoelectric conversion efficiency compared with platinum electrode under 100 mWcm-2(1 sun) AM1.5 illumination.

Long-Reach Passive Optical Network (LR-PON) is widely acknowledged as a promising solution for communication system in smart grid. Survivability is one of the key issues in the planning of LR-PON because massive high-rate traffic flows may be interrupted in case of network component failure. However, the survivability issue of LR-PON is addressed in few works. Most of previous works focus on single distribution fiber failure and remain untouched the simultaneous failure of multiple distribution fibers. In this paper, we focus on the survivability of LR-PON against single Shared-Risk Link Group (SRLG) failure. A reliability model is proposed to represent the probability of reliable connection for each Optical Network Unit (ONU). Based on this reliability model, we propose a novel Backup Fibers Protection (BFP) approach, aiming at the optimization of joint allocating backup capacity and deploying backup fibers. Through extensive simulation, we investigate the performance of BFP and demonstrate its effectiveness in different scenarios.

With the rapid development of the economic and social in Yongchuan, the town construction land and rural residential land have a trend of rising in recent years, and land is the main constraint for the economic and social development, So it is the only way to solve the problem for rural residential land intensive use. In this paper, the land intensive use indicator system was constructed, and then the appraisal model was constructed to study on rural residential land intensive use in Yongchuan. The level of rural residential land intensive use was divided into four grades according to comprehensive score, the corresponding grades were intensive use, moderate use, low efficient use and extensive use, respectively.

Currently the annulus pressure of gas well becomes more common, so the safe production of several wells has been seriously affected. The annulus pressure mechanism is relatively complex, and it can be approximately classified into annulus pressure induced by temperature effect, by ballooning effect and by leakage or seal failure etc. The article mainly focuses on the annulus pressure mechanism induced by ballooning effect and the corresponding calculation model. For the tubing column with two ends fixed and closed, when tubing internal pressure is larger than the external extrusion force, the external diameter of the tubing column balloons (i.e. ballooning effect). It reduces the annular volume between the tubing and the casing, and consequentially induces annulus pressure. Based on the fundamental theory of elastic-plastic mechanics, the tubing column is simplified into the thin walled cylinder so as to deduce the relation models between the internal pressure and its swell capacity and A annulus pressure value, which provide theoretical support for safety evaluation on annulus pressure and the next treatment program.

The simulation method of the article is based on the analysis of injection molding software MPI and grey system simulation method. The basic model of injection molding parameters are mold temperature, melt temperature and dwell time. So it gets technological parameter of volumetric shrinkage ratio with having been selected point. It comes to the value of simulation with using grey system GM (1, 1) and comparing the value with the measure value. It shows that the volume shrinkage rate which is obtained by using MPI simulation and by using GM (1, 1) grey prediction is consistent and the errors are within 2.2% after comparison. The conclusion is that using grey system GM (1, 1) can effectively predict the volume of injection plastic shrinkage rate and its change trend.

The detection of formaldehyde is very necessary and important in both industrial and residential environments. In this paper, a novel quartz crystal microbalances (QCM) formaldehyde gas sensor has been successful fabricated based on Polyethylenimine (PEI)-multi-walled carbon nanotubes (MWCNTs) composite films by the spraying process. The morphology of films was analyzed by scanning electron microscope (SEM), and formaldehyde-sensing properties of sensors were investigated. The results showed that the prepared QCM gas sensor exhibited good response and recovery behaviors towards formaldehyde gas in the concentration range of 0-10 ppm at room temperature, which also has the superior repeatability and selectivity. Moreover, the gas-sensing mechanism of sensors was studied.

Taiwan is a small island. Some of college campuses are very tiny with large hard pavement to cause un-comfortable outdoor environment. Most of faculty and students like to stay at classroom and use air-conditioner to establish comfort thermal environment. Thus, the outdoor and semi-outdoor thermal equipments are used to detect the parameters of weather. The test and analysis results show that hard pavements cause the un-comfortable outdoor comfort. Mean Radiant Temperatures of grass in summer is higher than the other pavement because that grass pavement is lack of moisture to causes bad outdoor thermal comfort. Therefore, the fine outdoor and semi-outdoor thermal comfort environment should consider the permeable pavement and grass with suitable moisture to cause better outdoor thermal environment and large arbores should be planted widely in campus to establish a better semi-outdoor thermal temperature in campus of the subtropical zone.

It takes the C26:33L6 engine as an example to simulate the LNG vaporization system on LNG powered ships. It establishes the dynamic mathematical model of the three-way valve, the vaporizer, the heater and the heat exchanger in LNG vaporization system. Then, the simulation model was established based on MATLAB. At last, it analyzes the LNG temperature at the heater outlet under different loads using the PID control in order to make LNG temperature stable to the engine.

The three commonly used remote sensing land surface temperature retrieval methods are described, namely single-window algorithm, split window algorithm and multi-channel algorithm, which have their advantages and disadvantages. The land surface temperature (LST) of study area was retrieved with multi-source remote sensing data. LST of study area was retrieved with the split window algorithm on January 10, 2003 and November 19, 2003 which is comparatively analyzed with the LST result of ETM+data with the single-window algorithm and the LST result of ASTER data with multi channel algorithm in the same period. The results show that land surface temperature of different land features are significantly different, where the surface temperature of urban land is the highest, and that of rivers and lakes is the lowest, followed by woodland. It is concluded that the expansion of urban green space and protection of urban water can prevent or diminish the urban heat island.

This paper is related to the vibration analysis of transmission line fitting vibration damper (TLFVD) using commercial ANSYS program. According to the basic structure of the TLFVD, the three dimensional model with different parameters including diameter and length of strand is established. Through the modal analysis of the TLFVD using ANSYS WORKBENCH, the first four-order natural frequencies and mode shapes is obtained. Comparing the simulation data of vibration characteristics, the effects of model parameters on the natural frequency are summarized. Finally, the optimized model has been selected from various models established, and the resonant frequency of the TLFVD was verified by the harmonic response analysis. As a result, the optimized model structure of the TLFVD is presented.

0.65(K0.5Bi0.5)TiO3–0.35BaTiO3 (0.65 KBT-0.35 BT3) ceramic was synthesized using a conventional calcination process (CC-process), and using a two-step calcination process that combined hydrothermal and CC processes (HT-CC-process). The effects of these two different calcination processes on the physical and dielectric properties of 0.65 KBT-0.35 BT3 ceramics were recorded and analyzed. When the CC-process was used, secondary phases—namely, BaBi4Ti4O15, K2TiO3, and K4Ti3O8—were observed in the XRD patterns of 0.65 KBT-0.35 BT3 ceramics. When the HT-CC-process was used, only the (K0.5Bi0.5)TiO3 (or (K0.5Bi0.5, Ba)TiO3) phase was observed in the XRD patterns, with no secondary phases. Due to the secondary phases, the CC-process 0.65 KBT-0.35 BT3 ceramic had lower dielectric peaks and broader temperature-dielectric constant curve than the 0.65 KBT-0.35 BT3 ceramic synthesized using the HT-CC-process.

This study mainly described a low-cost stereoscopic sensing scheme using a single Kinect device of Microsoft. Basically, the integration of infrared (IR) depth map with visible light image of Kinect could support the virtual 3-dimensional view. However, the precision and unstable displays are problems practically that means the unstable variation of 3D displays and distorted projections of Kinect IR projector make the depth maps non-reliable so that the virtual view usually non-acceptable with defects in many cases especially in low lamination and corners of the sensing objects. The study proposed an algorithm to rebuild a good depth map includes: free-holes filling, extrapolation and prediction of filling-loss holes, rectification and trimming of depth-edge deformation, modification of the depths for no-IR-detectable object and the sparse IR-detectable depths, and finally applying the bilateral filtering for the edge smoothing. The simulation result demonstrated that the proposed algorithm can provide an acceptable virtual 3-dimensional images and the calculation loads are suitable for real-time stereoscopic displays.

As a new azide-free gas generating pyrotechnic composition, the performance of four kinds of 5-aminotetrazole nitrate (5-ATN) gas generating compositions were investigated by hygroscopicity, compatibility, impact sensitivity, heat of combustion and burning temperature measurement. The advantages of the gas generant using KNO3 as an oxidizing agent include small hygroscopicity, better compatibility, lower impact sensitivity and proper burning temperature. The degree of water sorption in the mixed system with Sr (NO3)2 was much higher than that with KNO3. The participation of CuO can reduce the hygroscopicity of the system with Sr (NO3)2. As the oxidizing agent and catalyst, CuO can also decrease the impact sensitivity, heat of combustion and burning temperature of both systems. 5-ATN gas generant provides fair compatibility using 5-ATN as separate system.

The calculation of truss deformation under static loading is studied in this paper. First, an experiment was conducted to get the truss deformation for calibration. Second, the deformation was calculated by the principle of virtual work of structural mechanics and by Ansys. The calculated results agree well with the test result. Finally, some suggestions are presented to the calculation of more complicated truss structures.

The mesophase (iron aluminate, etc.) in steel slag was extracted by potassium hydroxide-sucrose (KOSH) solution method. The effects of partical size of steel slag, temperature and time of extraction on dissolution of mesophase phase were studied. The composition and morphology of the residue were analyzed by XRD and SEM. The results show the mesophase in steel slag powders (the weight was and the fineness was) could be fully dissolved when 4.00 g sample with a fineness about 600m2/kg is used and extraction temperature is kept at 90oC, however, other minerals in the steel slag could be hardly dissolved. The reason might be for that, in alkaline environment which provided by potassium hydroxide, the replacement of ions were took place between the mesophase in steel slag and the organic ligands formed by sugar and potassium hydroxide, and through the adsorption and polarization between ligand and steel slag surface, it will result in the decrease of activation energy of iron aluminate.

To study the fluidization properties and mixing properties of binary mixtures of quartz sand and coal char, the experiments were carried out in fluidized bed with an inner diameter of 50 mm. The pressure drop lines and mixing index were obtained under different operating conditions with changing the static bed height and the volume fraction of coal char. A new formula of mixing index was proposed to consider the difference of horizontal mixing behavior. The result showed that the static bed height does not make an appreciable influence to minimum fluidization velocity and fluidization status. However, the volume fraction of coal char affected the minimum fluidization velocity obviously, and the minimum fluidization velocity decreased monotonously with decreasing the volume fraction. Although the small volume fraction of coal char was good for mixing, the effect was limited by the height of bed and the mixing index becomes constant almost at 80mm static bed height when the volume fraction was less than 0.4.

A microstrip leaky wave antenna with operating frequency 2.5GHz is designed based on composite right/left handed transmission line. The beam scanning of the antenna can be controlled by changing the bias voltage of varactor in the antenna. And the performance, S-parameters and horizontal polarization pattern, of the antenna are investigated by simulation and experimental measurement, respectively. The results show that the designed antenna has better beam scanning, which is proper to be used in wireless local area networks and short-range wireless technology.

In this paper, the graphene-polyaniline (PANI) nanocomposite thin film was prepared by the in situ self-assembly method for the ammonia (NH3) gas sensor application, which was characterized by scanning electron microscopy (SEM) and UV-vis spectroscopy. The NH3 sensing performance and mechanism of the nanocomposite film were investigated. The results revealed that the sensor based on graphene-polyaniline nanocomposite film exhibited better sensing properties and restorability than those of single graphene film.

Threshold segmentation method was widely applied in image process and the selection of threshold affected the final results of image segmentation to a large extent. In order to improve the accuracy and the calculation speed of image segmentation, an Otsu threshold segmentation method based on genetic algorithm was offered. According to the threshold and the gray scale values of pixels, the pixels were divided into two categories, and then the genetic algorithm was used to find the maximum variance between clusters and obtain the optimal threshold of segmentation image. The experimental results show that this method can be used to segment the image effectively, which make the basis for image processing and analysis in the next step.

Polyaniline (PANI) nano-thin films were deposited on a novel microstructure silicon (MSS) substrate via in-situ self-assembly approach for NH3gas-sensing. The MSS was prepared by alkaline etching process, and gold interdigital electrodes were formed on the MSS surface by vacuum evaporation. The characterization of the MSS and PANI nanothin film were investigated by scanning electron microscope (SEM) and UV-Vis absorption spectroscopy. SEM images showed that the MSS exhibited an orderly uniform hemisphere array structure, and the MSS surface was covered by a compact PANI thin film which consists of PANI nanoparticles and PANI nanofibers. The gas-sensing properties of the sensor were examined at room temperature. The results revealed that the sensor exhibited a good response and recovery characteristics to NH3.

Image segmentation is an important part of the image process, and it is also the current hot and focus in image research. How to achieve better segmentation results are dominating targets of researchers. Currently, image segmentation based on clustering is the main research area. Firstly, this paper introduces the traditional C-means clustering algorithm and its characteristic has been analyzed. Then, the initial clustering center and the number are selected using the histogram. Finally, the image is converted from the RGB space to Lab space for clustering, and it has improved the accuracy and efficiency of image segmentation.

The application of traditional distance relay for four-parallel transmission lines is adversely affected by the mutual coupling between the lines. The result will lead to not achieved measured impedance calculation. And it has an effect on the operation of ground protection. In this paper, A new ground distance algorithm is proposed for single-phase grounding fault of four-parallel transmission lines. Based on the case of single-phase grounding fault, The first the relationship between fault point voltage and the voltage at protection installed location is presented by twelve-sequence component method. In the basis, According to the relationship of phase corner between the fault voltage and the fault current to eliminate the effect of fault voltage. The simulation results show that the new scheme has high sensitivity and reliability under different single-phase grounding fault of four-parallel transmission lines.

Measured southern jujube pest stress index leaf pigment, create jujube jujube leaf rust sensitive bands characteristic parameter table, analyze the spectral characteristics of the relevant characteristics and vegetation index jujube high correlation parameters. Determination of diseased leaves and growing spectrum of different pigment content. Analysis jujube leaf rust pigment content and spectral reflectance correlation study comparing jujube leaf rust pigment content and differential spectral correlation. Hyperspectral characteristic parameters to achieve the southern jujube jujube leaf rust pigments PC1/PC2 and PC1+PC2 content estimation. Using a combination of linear and polynomial fitting method to construct the canopy hyperspectral disease dates Brix content estimation model and test. The probabilistic neural network PNN and SVM classifier SVC applied to hyperspectral estimation model, comparative analysis of model accuracy. The results of the quantitative estimation of disease hyperspectral information dates pigment content in leaves of jujube growing use of high spectral monitoring and impact assessment of disease have high practical value. classification accuracy of 98%, obtained very satisfactory recognition results.

In this paper, Polyepichlorohyron(PECH)/multi-wall carbon nanotubes(MWCNTs) composite films and PECH/multi-wall carbon nanotubes twolayer film were deposited on interdigitated electrodes by airbrush technology to detect ethanol vapor of various concentrations at room temperature. Thickness and structure of the film were taken into account, so films of different thicknesses and with different structures were prepared respectively. The responses of the sensors to ethanol showed that composite film had a higher response thantwolayer film, and the thick composite film performed better than its counterpart when they were exposed to ethanol vapor.